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Take out the two flat ribbon cables going from TCon board to LCD panel. Clean the ends thoroughly with isopropyl alcohol and fit them back. Ordinary cleaning may not do the job and confuse you. Beware,company guys declare the panel to be defective for this fault.

Does the screen have a double image? or is one side of the screen darker and has a delay? If so, your LCD panel is failing, common problem with older Samsung LCD's. I have the same model in my dining room that had a double image, fixed it by taking the panel apart and applying thermal pads on top of the panel tabs. The set works like a champ to this day!!!

i had the same problem with my Dell computer and Samsung 931a monitor....after being on the phone with Dell for overe two hours and setting up a technician visit, i googled "computer monitor double image".....i went to Fixya and read several tips, but the one most often repeated worked immediately!....check and tighten your blue plug from your monitor to your computer!!

It could be a loose LCD connection carefully take off the back and lift the LCD very carfully you will see the ribbon cable lift the tab take out the LCD and reinsert it and push the tab back down. If this does not fix it you might have a damaged main board its one or the other.